TW201351150A - Portable device and peripheral extension dock - Google Patents

Abstract

An embodiment of the invention provides an electronic device comprising a body, a connector, a processor and a switching device. The processor coupled to the connector comprises a detection pin and a 1-wire pin. The switching device is coupled between the processor and the connector to connect one pin of the connector to the detection pin or the 1-wire pin. When a peripheral device connects to the connector, the processor control the switching device to connect the connector to the detection pin and the processor determines whether the peripheral device is a 1-wire device. When the peripheral device is determined as the 1-wire device, the processor controls the switching device to connect the connector to the 1-wire pin and executes a 1-wire communication with the peripheral device.

Description

Handheld electronic device and peripheral expansion device

The invention relates to a communication method between an electronic device and a peripheral device, in particular to a communication method between the electronic device and the single-line peripheral device.

Handheld electronic devices, such as smart phones, tablets or personal digital assistants, have become a necessity for consumer personal or official use. In order to increase the utility of the handheld electronic device, it is necessary to increase the functionality of the handheld electronic device through different peripheral devices. Furthermore, in order to reduce the type of connection of the handheld electronic device and to reduce the complexity of the bus interface, a 1-wire bus is thus employed. A 1-wire bus is one of the simplest forms of bus. It performs all control and communication through a single transmission line, which not only saves input and output, but also simplifies system design and reduces hardware cost. However, the handheld electronic device is not connected to the single-wire peripheral device, and the handheld electronic device will continue to poll the single-wire busbar, which affects the limited power of the handheld electronic device, and the use time of the handheld electronic device is therefore reduce.

An embodiment of the invention provides an electronic device including a body, a port, a processor, and a switching device. The port is connected to the body and can be inserted by a peripheral device to allow the peripheral device to be electrically connected to the electronic device. The processor is electrically connected to the port, and includes a detecting pin and a single wire communication pin. The switching device is coupled between the processor and the port, and selectively connects the port to the detecting connection The foot is either one of the above single-wire communication pins. When the peripheral device is inserted into the port, the processor instructs the switching device to connect the port to the detecting pin, and determines whether the peripheral device is a single wire device through the detecting pin. When the processor determines that the peripheral device is a single-wire device, the processor instructs the switching device to connect the port to the single-wire communication pin, and performs a single-wire communication with the peripheral device through the single-wire communication pin.

Another embodiment of the present invention provides an electronic device electrically connected to an expansion device to generate a single-wire data path and an interruption path, wherein the expansion device is electrically connected to the at least one peripheral device. The electronic device includes a body, a port, a processor, and a switching device. a connection device, the device is electrically connected to the expansion device, and is electrically connected to the peripheral device through the expansion device, wherein when the expansion device connects or removes the peripheral device, an interrupt signal is Transfer to this port. The processor is electrically connected to the port, and has a detecting pin, a single wire communication pin, and an interrupt pin. The interrupt pin is connected to the interrupt path through the port to receive the interrupt signal. The switching device is coupled between the processor and the port, and selectively connects the detecting pin or one of the single-wire communication pins to the single-wire data path. When the processor receives the interrupt signal from the interrupt pin, the switching device couples the single-wire communication pin to the upper single-wire data path, and the processor scans and connects to the expansion device by using the single-wire data path. A state of the peripheral device described above.

Another embodiment of the present invention provides a peripheral expansion device coupled to a handheld electronic device. The peripheral expansion device includes a first connection portion, a second connection portion, and a controller. a first connecting portion connected to a single line The peripheral device includes a first detecting pin and a first single wire communication pin. The second connecting portion is connected to a peripheral device, and includes a second detecting pin and a second single wire communicating pin. The controller includes a first interrupt pin coupled to the first detect pin, a second interrupt pin coupled to the second detect pin, and an output pin. When the logic state of the first interrupt pin or the second interrupt pin changes, an interrupt signal is output to the handheld electronic device, and the handheld electronic device and the single-wire peripheral device or the peripheral device are established. Electrical connection.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

1 is a schematic diagram of an embodiment of a handheld electronic device in accordance with the present invention. The handheld electronic device 11 has a body, wherein the processor 111 and the switching device 112 are disposed inside the body, and the connector 113 is disposed on the body for connecting the external device. The handheld electronic device 11 is connected to the connector 122 of the peripheral device 12 via a connector 113. In this embodiment, the connector 113 can use a micro USB connector. The Micro USB connector contains 5 pins, one of which recognizes the pin (P1 on the first picture) only applies to the USB On-The-Go specification. Normally it will not be used, so the foot can be used. Bit P1 is used as the pin used by the 1-wire protocol. The switching device 112 is configured to establish the processor 111 Connecting with the peripheral device 12, and selecting to establish the endpoint A and the endpoint B0 or the endpoint A and the endpoint B1 according to a selection signal output by the processor 111 through the second general-purpose output input pin (GPIO_2) The connection between the two. The second general purpose output input pin (GPIO_2) is coupled to the end point S of the switching device 112. In the default case, the switching device 112 is preset to establish a connection between the endpoint A and the endpoint B0. In an embodiment of the invention, the switching device 112 is a multiplexer.

A first first general-purpose output pin (GPIO_1) of the processor 111 is coupled to the end B0 of the switching device 112, and a first resistor R1 is coupled between the terminal N1 and the voltage Vcc. The pin P2 of the connector 122 is coupled to a single-line authentication controller 121 and coupled to a ground potential through a resistor Rs. In the present embodiment, the resistance of the resistor R1 is about 100 k Ω, and the resistance of the resistor Rs is about 15 k Ω. When the peripheral device 12 is connected to the handheld electronic device 11, the voltage at the terminal N1 is pulled down to a low voltage level. The processor 111 detects a voltage change through the pin GPIO_1, triggers an interrupt signal, and allows the handheld electronic device 11 to know that there is a peripheral device connection at this time. The detecting device 115 detects the voltage of the terminal N1 at this time, and determines whether the peripheral device 12 is a 1-wire peripheral device. In the present embodiment, if the peripheral device 12 is a 1-wire peripheral device, the resistance of the resistor Rs is 15 K Ω. If it is another peripheral device, the resistance of the resistor Rs may not be 15K Ω. Therefore, the detecting device 115 can determine whether the resistance value of the pull-down resistor Rs in the peripheral device 12 is a single-line peripheral device according to the voltage of the terminal N1.

If it is determined that the peripheral device 12 is a 1-wire peripheral device, the processor 111 sends a selection signal to the switching device 112 to switch. Device 112 establishes a connection between endpoint A and endpoint B1. Next, a 1-wire master 114 in the processor 111 performs 1-wire communication with the 1-wire authentication controller 121. When the communication is over, the processor 111 again notifies the switching device 112 that the switching device 112 establishes a connection between the endpoint A and the endpoint B0. In this embodiment, the single-line main controller may be a specific circuit in the processor 111, a functional component, a program executed by the processor 111, or a program executed by the processor 111 through a specific program. a logic circuit. In this embodiment, the processor 111 controls the switching device 112 by controlling the logic level of the pin GPIO_2. For example, when the logic level of the pin GPIO_2 is the logic level 0, the switching device 112 establishes a connection between the terminal A and the end point B0. When the logic level of the pin GPIO_2 is the logic level 1, The switching device 112 establishes a connection between the endpoint A and the endpoint B1.

2 is a flow chart of an embodiment of a method for detecting and communicating peripheral devices in accordance with the present invention. The method of the present embodiment is particularly suitable for a handheld electronic device having a 1-wire communication function, and can reduce the power consumption of the handheld electronic device. Conventional handheld electronic devices continuously poll the peripheral devices to determine if there is a 1-wire peripheral device connection. However, the method of this embodiment only performs single-letter communication when it detects that the connected peripheral device is a single-line peripheral device. In step S21, a first connection is established, such as the connection between the end point A and the end point B0 in FIG. Briefly, the first connection is a connection between a detector or a detection unit in the handheld device and a connector of the handheld electronic device. With the first connection, the peripheral device is determined to be There is no connection to the handheld electronic device. In step S22, it is determined whether the peripheral device is connected to the handheld electronic device. In this embodiment, if the peripheral device is connected to the handheld electronic device, an interrupt signal is generated and transmitted to a processor in the handheld device. For example, the detector is connected to a pin of the connector. When the peripheral device is connected to the handheld electronic device, the voltage of the pin is pulled down to a low voltage level or pulled up to a high voltage level. The bit, an interrupt signal is thus generated to inform the processor within the handheld electronic device that a peripheral device is connected to the handheld electronic device. If no peripheral device is connected to the handheld electronic device, step S24 is performed to maintain the current first connection.

In step S23, a detecting device in the handheld electronic device determines whether the peripheral device connected at this time is a single-line peripheral device. If not, step S24 is performed to maintain the current first connection. If yes, step S25 is performed. In step S25, the first connection is cut and a second connection is established, such as the connection between the end point A and the end point B1 in FIG. . Briefly, the second connection is a connection between a single-wire main controller and a connector of a handheld electronic device in a handheld electronic device. The second connection is used to perform 1-wire communication with a single-line authentication controller in the peripheral device. When the single-line main controller and the single-line authentication controller in the peripheral device end the single-line communication, a selection signal is transmitted to a switching device for cutting the second connection and establishing the first connection. Therefore, in step S25, it is judged whether or not the one-line communication is ended. If the single line communication has not ended, step S27 is performed to maintain the second connection. If the one-line communication has ended, step S28 is executed to cut off the second connection and establish a first connection.

Figure 3 is a view of an embodiment of a peripheral expansion device according to the present invention schematic diagram. The peripheral expansion device 32 has a first connector 323 and a second connector 324, each of which includes a single-wire communication pin and a detection pin. The detection pin of the first connector 422 is coupled to the pin GP1 of the controller 321, and the detection pin of the second connector 324 is coupled to the pin GP2 of the controller 321. When the first connector 323 or the second connector 324 is connected to a peripheral device, the voltage of the pin GP1 or GP2 is pulled down to a ground potential or a high voltage level, so that the controller 321 knows that there is a peripheral device at this time. Connected to the peripheral expansion unit 32. In FIG. 3, the first connector 323 is connected to a single-wire peripheral device 33, and the second connector 324 is connected to a USB device 34. Since the USB device 34 does not support single-line communication, the single-wire communication pin of the second connector 324 does not operate. In this embodiment, the first connector 323 and the second connector 324 are micro USB connectors, wherein the identification pin is used as the single-line communication pin in the embodiment.

The peripheral expansion device 32 is connected to the handheld electronic device 31 as a medium for single-letter communication between the handheld electronic device 31 and the peripheral device. Both the first connector 323 and the second connector 324 include a single-wire communication pin coupled to a single-wire device detector 322 in the controller 321 . The single line device detector 322 determines whether the peripheral device connected to the first connector 323 or the second connector 324 is a single line peripheral device. If so, the controller 321 transmits a control signal SC1 to the switch 312 through the pin GP3. . When a peripheral device is connected to or removed from the peripheral expansion device 32, the peripheral expansion device 32 detects all the peripheral devices currently connected to know whether the currently connected peripheral device has a single-line peripheral device. . If a single line peripheral device is detected, the controller 321 transmits a control signal SC1 to the switch 312 through the pin GP3. Single line device detector 322 For the detection operation, reference may be made to the operation of the detecting device 115 in FIG. 1 and will not be described here. The peripheral expansion device 32 connects the first connector 323 with the single-wire communication pin of the second connector 324 and is connected to the switching device 312 of the handheld electronic device 31. When the switching device 312 receives the control signal SC1, the switching device 312 is turned on, so that the single-wire controller 312 in the processor 311 is electrically connected to the single-wire communication pins of the first connector 323 and the second connector 324. Next, the single-line main controller 313 performs one-line communication with the peripheral devices one by one. If the peripheral device is not a single-wire peripheral device, it will not respond to signals, data or requests transmitted by the single-line main controller 313. When the single-line main controller 313 communicates with all of the peripheral devices, a control signal SC2 is transmitted to the switching device 312 to turn off the switching device 312.

Figure 4 is a schematic illustration of an embodiment of a peripheral expansion device in accordance with the present invention. The peripheral expansion device 42 has a first connector 422 and a second connector 423. Each of the connectors includes a single-wire communication pin and a detection pin. The detection pin of the first connector 422 is coupled to the pin GP1 of the controller 421, and the detection pin of the second connector 423 is coupled to the pin GP2 of the controller 421. When the first connector 422 or the second connector 423 is connected to a peripheral device, the voltage of the pin GP1 or GP2 is pulled down to a ground potential or a high voltage level, so that the controller 421 knows that there is a peripheral device at this time. Connected to the peripheral expansion device 42. In FIG. 4, the first connector 422 is connected to a single-wire peripheral device 43, and the second connector 423 is connected to a USB device 44. Since the USB device 44 does not support single-line communication, the single-wire communication pin of the second connector 423 does not operate. In this embodiment, the first connector 422 and the second connector 423 are micro USB connectors, wherein the identification pin is used as the single-line communication pin in the embodiment.

When a peripheral device is connected to or removed from the peripheral expansion device 42, the peripheral expansion device 42 transmits an interrupt signal to the pin GPIO_3 of the processor 411. The handheld electronic device 41 includes a processor 411 and a switching device 412. The switching device 412 is configured to establish a connection between the processor 411 and the peripheral expansion device 42 and select to establish the endpoint A and the endpoint according to a selection signal output by the processor 411 through the second general-purpose output input pin (GPIO_2). B0 or the connection between endpoint A and endpoint B1. The second general purpose output input pin (GPIO_2) is coupled to the end point S of the switching device 412. In the default case, the switching device 412 is preset to establish a connection between the endpoint A and the endpoint B0. In an embodiment of the invention, the switching device 412 is a multiplexer.

When the processor 411 receives the interrupt signal transmitted by the peripheral expansion device 42, the detecting device 414 detects whether there is a single-line peripheral device in the peripheral device connected to the peripheral expansion device 42 at this time. The detecting device 414 detects the voltage of the terminal B0 at this time and determines whether a 1-wire peripheral device is connected to the peripheral expansion device 42. In this embodiment, if the peripheral device is a 1-wire peripheral device, the pin connected to the single-wire communication pin of the peripheral expansion device 42 is coupled to a resistor Rs having a resistance value of 15K Ω. In this embodiment, when the single-wire peripheral device 43 is electrically connected to the detecting device 414, the voltage of the terminal B0 is lowered. Therefore, the detecting means 414 can estimate the resistance value of the resistor Rs based on the voltage of the terminal B0. If the obtained resistance is about 15K Ω. It means that the peripheral expansion device 42 is connected to the single-line peripheral device at this time.

If the detecting device 414 determines that a single-wire peripheral device is connected to the peripheral expansion device 42 at this time, the processor 411 sends a selection signal to the switching device. 412, causing the switching device 412 to establish a connection between the endpoint A and the endpoint B1. Next, a 1-wire master 413 in the processor 411 performs 1-wire communication with a 1-wire authentication controller 431. The single-line main controller 413 performs one-line communication with the peripheral devices connected to the peripheral expansion device 42 one by one. If the peripheral device is not a single-wire peripheral device, it will not respond to signals, data or requests transmitted by the single-line main controller 413. After the single-line main controller 413 communicates with all the peripheral devices, the single-line main controller 413 records a status data of the peripheral devices connected to the peripheral expansion device 42 at this time. For example, the status data includes identification information of the connector, whether the peripheral device connected to the connector is a data of the single-line peripheral device, the type of the single-wire peripheral device, or identification information.

In this embodiment, the handheld device 41 further includes a storage unit for storing a complex array of codes. When the one-line communication ends, the single-line main controller 413 compares the identification data received by the single-wire communication with the stored electric code to identify the peripheral device.

When the one-line communication ends, the processor 411 again notifies the switching device 412 that the switching device 412 establishes a connection between the endpoint A and the endpoint B0. In this embodiment, the single-line main controller 413 may be a specific circuit in the processor 413, a function component, a program executed by the processor 413, or a program executed by the processor 413 through a specific program. A logic circuit that converts. In this embodiment, the processor 411 controls the switching device 413 by controlling the logic level of the pin GPIO_2. For example, when the logic level of the pin GPIO_2 is a logic level 0, the switching device 412 establishes a connection between the terminal A and the end point B0. When the logic level of the pin GPIO_2 is a logic When bit 1, the switching device 412 establishes a connection between the endpoint A and the endpoint B1.

In this embodiment, when the peripheral device is connected to or removed from the peripheral expansion device 42, the peripheral expansion device 42 sends an interrupt signal INT_O to the processor 411, and then the detection device 414 detects the connection at this time. Whether there is a single line peripheral device in the peripheral device to the peripheral expansion device 42. If the detecting means 414 determines that a single-wire peripheral device is connected to the peripheral expansion device 42, the processor 411 sends a selection signal to the switching device 412 to cause the switching device 412 to establish a connection between the terminal A and the terminal B1. Next, the single-line main controller 413 repeats the above-described operations, and details are not described herein.

Figure 5 is a schematic illustration of an embodiment of a single wire peripheral device in accordance with the present invention. The single line peripheral device 51 includes a connector 511 and a single line authentication controller 512. A pin of the connector 511 is grounded through a resistor Rs, wherein the resistance of the resistor Rs is 15K Ω. When the single-wire peripheral device 51 is connected to an electronic device having a single-wire communication function, the resistor Rs causes the electronic device to generate an interrupt signal informing that the single-wire peripheral device 51 is connected to the electronic device. Next, the single line authentication controller 512 performs single line communication with the electronic device. When the one-line communication ends, the electronic device and the single-line peripheral device 51 interrupt the single-wire communication connection. In another embodiment, after the single-wire communication ends, the single-line authentication controller 512 sends a control signal to the electronic device to interrupt the single-wire communication link.

Figure 6 is a flow chart showing another embodiment of a method for detecting and communicating peripheral devices in accordance with the present invention. The method of the present embodiment is particularly suitable for a handheld electronic device having a 1-wire communication function to reduce the power consumption of the handheld electronic device. Traditional handheld electronic devices continue to polling peripheral devices to determine if there is a single A 1-wire peripheral device is connected. However, the method of this embodiment only performs single-letter communication when it detects that the connected peripheral device is a single-line peripheral device. In step S61, the peripheral device establishes a first connection with the handheld electronic device through a peripheral expansion device, such as the connection between the endpoint A and the endpoint B0 in FIG. Briefly, the first connection is a connection between a detector or a detection unit in the handheld device and a connector of the handheld electronic device. In step S62, the handheld electronic device detects whether there is a peripheral expansion device. If not, it is maintained at step S62. If yes, step S63 is performed to establish a second connection and the first connection is cut. The second connection is the connection between the endpoint A and the endpoint B1 in FIG. Briefly, the second connection is a connection between a single-wire main controller and a connector of a handheld electronic device in a handheld electronic device.

In step S64, the handheld electronic device detects whether a peripheral device is connected to the peripheral expansion device. In this embodiment, when a peripheral device is connected to the peripheral expansion device, the peripheral expansion device sends an interrupt signal to the handheld electronic device. If no peripheral device is connected to the peripheral expansion device, step S64 is maintained. If there is a peripheral device connected to the peripheral expansion device, step S65 is performed. In step S65, the handheld electronic device utilizes the second connection to perform 1-wire communication with a single-line authentication controller in the peripheral device. In step S66, the handheld electronic device records the status of all of the single-wire peripheral devices connected to the peripheral expansion device. In another embodiment, the handheld electronic device records the status of all of the peripheral devices connected to the peripheral expansion device. In step S67, the handheld electronic device detects whether the peripheral expansion device has been removed. If yes, step S61 is performed, and if not, step S64 is performed.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention.

11‧‧‧Handheld electronic devices

111‧‧‧ Processor

112‧‧‧Switching device

113‧‧‧Connector

114‧‧‧One-line main controller

115‧‧‧Detection device

12‧‧‧ peripheral devices

122‧‧‧Connector

121‧‧‧One-line authentication controller

31‧‧‧Handheld electronic devices

32‧‧‧ peripheral expansion devices

33‧‧‧Single line peripheral

34‧‧‧USB device

311‧‧‧ processor

312‧‧‧Switching device

313‧‧‧Single line master controller

321‧‧‧ Controller

322‧‧‧Single line device detector

323‧‧‧First connector

324‧‧‧Second connector

331‧‧‧ single line certification controller

41‧‧‧Handheld electronic devices

42‧‧‧ peripheral expansion unit

43‧‧‧Single line peripheral

44‧‧‧USB device

411‧‧‧ processor

412‧‧‧Switching device

413‧‧‧Single line master controller

414‧‧‧Detection device

421‧‧‧ Controller

422‧‧‧Connector

423‧‧‧Connector

431‧‧‧Single line authentication controller

51‧‧‧Single line peripheral device

511‧‧‧Connector

512‧‧‧ single line certification controller

1 is a schematic diagram of an embodiment of a handheld electronic device in accordance with the present invention.

2 is a flow chart of an embodiment of a method for detecting and communicating peripheral devices in accordance with the present invention.

Figure 3 is a schematic illustration of an embodiment of a peripheral expansion device in accordance with the present invention.

Figure 4 is a schematic illustration of an embodiment of a peripheral expansion device in accordance with the present invention.

Figure 5 is a schematic illustration of an embodiment of a single wire peripheral device in accordance with the present invention.

Figure 6 is a flow chart showing another embodiment of a method for detecting and communicating peripheral devices in accordance with the present invention.

11‧‧‧Handheld electronic devices

111‧‧‧ Processor

112‧‧‧Switching device

113‧‧‧Connector

114‧‧‧One-line main controller

115‧‧‧Detection device

12‧‧‧ peripheral devices

122‧‧‧Connector

121‧‧‧One-line authentication controller

Claims (21)

An electronic device comprising: a housing; a connection device disposed on the body and insertable by a peripheral device to allow the peripheral device to be electrically connected to the electronic device; a processor electrically connected to The connection port includes a detection pin and a single-wire communication pin; a switching device coupled between the processor and the port, selectively connecting the port to the detecting pin or the One of the single-wire communication pins; when the peripheral device is inserted into the connection port, the processor instructs the switching device to connect the connection port to the detection pin, and determines whether the peripheral device is a single-wire device; when the processor determines that the peripheral device is a single-wire device, the processor instructs the switching device to connect the port to the single-wire communication pin, and performs the peripheral device with the single-wire communication pin A single line communication. The electronic device of claim 1, wherein, after the single-wire communication ends, the processor outputs the switching signal, so that the switching device connects the connection port to the detection pin The electronic device of claim 1, wherein the peripheral device has a connector, wherein the connector is sized to be compatible with the connector such that the electronic device can be electrically connected to the peripheral device. The electronic device of claim 1, wherein the switching device comprises: A first terminal is coupled to a first pin of the port; a second terminal is coupled to the single-wire communication pin; and a third terminal is coupled to the detecting pin. The electronic device of claim 1, wherein the detecting pin is a general-purpose output input pin, and the detecting pin is coupled to a voltage source through a first resistor. When a voltage of the foot is pulled down to a low voltage level, the processor determines that the peripheral device is electrically connected to the electronic device. The electronic device of claim 1, wherein the connection port is a micro USB port, and the first pin is an identification pin of the micro USB port. The electronic device as claimed in claim 1, further comprising a storage unit for storing the complex array code. When the single line communication ends, the processor compares the identification data received by the single line communication with the stored code. To identify the peripheral device or to record a state of the peripheral device. An electronic device is electrically connected to an expansion device to generate a single-wire data path and an interruption path, wherein the expansion device is electrically connected to at least one peripheral device, the electronic device includes: a body; a connection device And being electrically connected to the expansion device to be electrically connected to the peripheral device through the expansion device, wherein an interrupt signal is transmitted to the connection device when the expansion device connects or removes the peripheral device a processor electrically connected to the port, having a detecting pin, a single-wire communication pin, and an interrupt pin, wherein the interrupt pin passes through the connection Connected to the interrupt path to receive the interrupt signal; a switching device coupled between the processor and the port, selectively connecting the detecting pin or one of the single-wire communication pins And the single-wire data path; wherein, when the processor receives the interrupt signal from the interrupt pin, the switching device couples the single-wire communication pin to the upper single-wire data path, and the processor uses the single-wire data path Scanning a state of the peripheral device connected to the expansion device. The electronic device of claim 8, wherein the processor scans and records the state of the peripheral device connected to the expansion device through the single-line data path and generates a status data, and the processor generates the After the status data, the scanning of the peripheral devices is stopped. The electronic device of claim 9, wherein the processor determines whether the peripheral device supports single-line communication through the detecting pin, and performs single-line communication with the peripheral device through the single-wire communication pin. The electronic device of claim 8, wherein the switching device comprises: a first terminal coupled to a first pin of the port; and a second terminal coupled to the single wire communication a foot; and a third end point coupled to the detecting pin. The electronic device of claim 8, wherein the detecting pin is a general-purpose output input pin, and the detecting pin is coupled to a voltage source through a first resistor. When a voltage of the foot is pulled down to a low voltage level, the processor determines that the peripheral device is electrically connected to the electronic device. The electronic device of claim 8, wherein the connection port is a micro USB port, and the first pin is an identification pin of the micro USB port. The electronic device as claimed in claim 8, further comprising a storage unit for storing the complex array code, wherein when the single line communication ends, the processor compares the identification data and the stored code received by the single line communication. To identify the peripheral device or to record a state of the peripheral device. A peripheral expansion device is connected to an electronic device, comprising: a first connection portion connected to a single-line peripheral device, including a first detection pin and a first single-wire communication pin; and a second connection portion The device includes a second detecting pin and a second single wire communication pin; and a controller, comprising: a first interrupt pin coupled to the first detecting pin; and a second interrupt a pin, coupled to the second detecting pin; and an output pin, when the logic state of the first interrupt pin or the second interrupt pin changes, outputting an interrupt signal to the electronic device, and Establishing an electrical connection between the electronic device and the single-wire peripheral device or the peripheral device. The peripheral expansion device of claim 15, wherein the electronic device performs a single line communication with the single line peripheral device through the electrical connection. The peripheral expansion device of claim 15, wherein the single-wire peripheral device is connected to the first connection or from the first connection When the part is removed, a logic state of the first detection pin is changed. The peripheral expansion device of claim 15, wherein a logic state of the first detection pin is changed when the peripheral device is connected to or removed from the first connection portion. . The peripheral expansion device of claim 15, wherein the peripheral device is a USB peripheral device. The peripheral expansion device of claim 15, wherein the first connection portion is a micro USB connection portion, and the first single-wire communication pin is located at an identification pin of the micro USB connector. The peripheral expansion device of claim 15, wherein the second connection portion is a micro USB connection portion, and the second single-wire communication pin is located at an identification pin of the micro USB connector.